Comments

I like this one since I like good rebuses and I like baseball. I would kind of nitpick that "Three up three down" is something one would say during the game, but "end of AN inning" is not. I thing "end of the inning" would be better, or better yet "inning over." Going a little bit outside the box here, but what about:

ing
ET
EH
RR
HE
TE
over

"Three up, three down" is sandwiched between "ing" and "over." So it's " 'three up, three down' IN 'ing over' ".